Search Results for author: Eunju Cha

Found 9 papers, 1 papers with code

Self-Supervised Dense Consistency Regularization for Image-to-Image Translation

no code implementations CVPR 2022 Minsu Ko, Eunju Cha, Sungjoo Suh, Huijin Lee, Jae-Joon Han, Jinwoo Shin, Bohyung Han

Unsupervised image-to-image translation has gained considerable attention due to the recent impressive progress based on generative adversarial networks (GANs).

Translation Unsupervised Image-To-Image Translation

DeepPhaseCut: Deep Relaxation in Phase for Unsupervised Fourier Phase Retrieval

no code implementations20 Nov 2020 Eunju Cha, Chanseok Lee, Mooseok Jang, Jong Chul Ye

Unlike the existing deep learning approaches that use a neural network as a regularization term or an end-to-end blackbox model for supervised training, our algorithm is a feed-forward neural network implementation of PhaseCut algorithm in an unsupervised learning framework.

Image Reconstruction Retrieval

Two-Stage Deep Learning for Accelerated 3D Time-of-Flight MRA without Matched Training Data

no code implementations4 Aug 2020 Hyungjin Chung, Eunju Cha, Leonard Sunwoo, Jong Chul Ye

Time-of-flight magnetic resonance angiography (TOF-MRA) is one of the most widely used non-contrast MR imaging methods to visualize blood vessels, but due to the 3-D volume acquisition highly accelerated acquisition is necessary.

Image Reconstruction

Geometric Approaches to Increase the Expressivity of Deep Neural Networks for MR Reconstruction

no code implementations17 Mar 2020 Eunju Cha, Gyutaek Oh, Jong Chul Ye

Recently, it was shown that an encoder-decoder convolutional neural network (CNN) can be interpreted as a piecewise linear basis-like representation, whose specific representation is determined by the ReLU activation patterns for a given input image.

BOOSTING ENCODER-DECODER CNN FOR INVERSE PROBLEMS

no code implementations25 Sep 2019 Eunju Cha, Jaeduck Jang, Junho Lee, Eunha Lee, Jong Chul Ye

However, the computation of the divergence term in SURE is difficult to implement in a neural network framework, and the condition to avoid trivial identity mapping is not well defined.

Denoising

Boosting CNN beyond Label in Inverse Problems

no code implementations18 Jun 2019 Eunju Cha, Jaeduck Jang, Junho Lee, Eunha Lee, Jong Chul Ye

In this paper, we show that the recent unsupervised learning methods such as Noise2Noise, Stein's unbiased risk estimator (SURE)-based denoiser, and Noise2Void are closely related to each other in their formulation of an unbiased estimator of the prediction error, but each of them are associated with its own limitations.

k-Space Deep Learning for Parallel MRI: Application to Time-Resolved MR Angiography

no code implementations3 Jun 2018 Eunju Cha, Eung Yeop Kim, Jong Chul Ye

Time-resolved angiography with interleaved stochastic trajectories (TWIST) has been widely used for dynamic contrast enhanced MRI (DCE-MRI).

Deep Convolutional Framelets: A General Deep Learning Framework for Inverse Problems

4 code implementations3 Jul 2017 Jong Chul Ye, Yoseob Han, Eunju Cha

Using numerical experiments with various inverse problems, we demonstrated that our deep convolution framelets network shows consistent improvement over existing deep architectures. This discovery suggests that the success of deep learning is not from a magical power of a black-box, but rather comes from the power of a novel signal representation using non-local basis combined with data-driven local basis, which is indeed a natural extension of classical signal processing theory.

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